Abstract
When water oxidation by photosystem II (PSII) is impaired, an oxidized chlorophyll (ChlZ +) is formed that quenches excitation and may prevent photodamage. Both the identification of this Chl+ and the mechanism of its oxidation and reduction are controversial. Using the available X-ray structures of PSII we calculated the efficiency of two proposed quenchers, ChlZ +(D1) and ChlZ +(D2). Of these two, only ChlZ +(D1) can quench to the degree observed experimentally. We also identify a chain of closely spaced pigments in the structure from Thermosynechococcus vulcanus that we propose to form a novel electron transport pathway between ChlZ(D1), β-carotene, P680+ and cytochrome b559.
| Original language | English |
|---|---|
| Pages (from-to) | 159-163 |
| Number of pages | 5 |
| Journal | FEBS Letters |
| Volume | 543 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - May 22 2003 |
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Keywords
- Chlorophyll fluorescence
- Electron transport
- Excitation energy transfer
- Non-photochemical quenching
- Photosynthesis
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology
Cite this
The X-ray structure of photosystem II reveals a novel electron transport pathway between P680, cytochrome b559 and the energy-quenching cation, ChlZ + . / Vasil'ev, Sergej; Brudvig, Gary W; Bruce, Doug.
In: FEBS Letters, Vol. 543, No. 1-3, 22.05.2003, p. 159-163.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The X-ray structure of photosystem II reveals a novel electron transport pathway between P680, cytochrome b559 and the energy-quenching cation, ChlZ +
AU - Vasil'ev, Sergej
AU - Brudvig, Gary W
AU - Bruce, Doug
PY - 2003/5/22
Y1 - 2003/5/22
N2 - When water oxidation by photosystem II (PSII) is impaired, an oxidized chlorophyll (ChlZ +) is formed that quenches excitation and may prevent photodamage. Both the identification of this Chl+ and the mechanism of its oxidation and reduction are controversial. Using the available X-ray structures of PSII we calculated the efficiency of two proposed quenchers, ChlZ +(D1) and ChlZ +(D2). Of these two, only ChlZ +(D1) can quench to the degree observed experimentally. We also identify a chain of closely spaced pigments in the structure from Thermosynechococcus vulcanus that we propose to form a novel electron transport pathway between ChlZ(D1), β-carotene, P680+ and cytochrome b559.
AB - When water oxidation by photosystem II (PSII) is impaired, an oxidized chlorophyll (ChlZ +) is formed that quenches excitation and may prevent photodamage. Both the identification of this Chl+ and the mechanism of its oxidation and reduction are controversial. Using the available X-ray structures of PSII we calculated the efficiency of two proposed quenchers, ChlZ +(D1) and ChlZ +(D2). Of these two, only ChlZ +(D1) can quench to the degree observed experimentally. We also identify a chain of closely spaced pigments in the structure from Thermosynechococcus vulcanus that we propose to form a novel electron transport pathway between ChlZ(D1), β-carotene, P680+ and cytochrome b559.
KW - Chlorophyll fluorescence
KW - Electron transport
KW - Excitation energy transfer
KW - Non-photochemical quenching
KW - Photosynthesis
UR - http://www.scopus.com/inward/record.url?scp=0038054644&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0038054644&partnerID=8YFLogxK
U2 - 10.1016/S0014-5793(03)00442-3
DO - 10.1016/S0014-5793(03)00442-3
M3 - Article
VL - 543
SP - 159
EP - 163
JO - FEBS Letters
JF - FEBS Letters
SN - 0014-5793
IS - 1-3
ER -